I have moc 2.5.0_alpha4 compiled on gentoo with gcc 4.6.2, glibc is 2.13-r4. Sometimes it crashes with ** glibc detected *** mocp: free(): invalid next size (normal): 0x082b1c70 *** or similar error. I can't exactly catch the moment when it crashes. After showing this error and freezing interface moc continues to play. If I kill the interface and then start it, it freezes on getting playlist. The same problem was with previuos versions of moc and glibc.